The first "Americans" were indigenous native American Indians who did NOT speak Spanish.

You are exactly right, I misspoke. Many of them STILL speak native tongues.

I was lucky enough to have the chance to hear Quechua spoken when I was in Peru earlier this year, not much different than what the Inca spoke before the Spanish landed.

Now imagine some Spanish speaking Peruvian hearing someone speaking the Quechua that their families have spoken for centuries, and telling them that they ought to be speaking Spanish because it makes other Spanish speakers feel more comfortable.